Who You Want
You need your examiners to be experienced, capable, trained, available and interested. If the academic you’re thinking about is missing any of these criteria then they can’t be your examiner.
You might want your future examiner to be someone you’ve cited. You might find comfort in them being a familiar face from conferences. You might want a particular individual because their work connects with your future research plans.
If any of your wants feel particularly important then talk with your supervisors and see what can be arranged. Candidates don’t get to choose their examiners but you might be able to steer their nomination.
The needs will be guaranteed. What can you do to get who you want?